John Burbine, 49, videotaped himself raping at least 13 young victims, who range in age from 8 days to 3 1/2 years old, Leone said.

Burbine was indicted on 40 counts of aggravated forcible rape of child, subsequent offense; 17 counts of aggravated indecent assault and battery on a child, subsequent offense; 12 counts of posing a child in a state of nudity; 11 counts of posing a child in sexual conduct; 13 counts of possession of child pornography; two counts of dissemination of material harmful to a minor and operating an unlicensed child care program, Leone said.

"He committed these unspeakable crimes in the victims’ homes and communities. Further, the defendant filmed the repeated, unthinkable abuse. The defendant gained access and opportunity to abuse young children through advertising child care services with his wife, who operated a tutoring and child care business, which was not licensed," Leone said.

According to investigators, Burbine raped and sexually assaulted boys and girls who were in his care, many of whom were abused multiple times over several months or years, from August 2010 through August 2012.

The assaults took place in the victims’ homes after Burbine and his wife, Marian, advertised child care and tutoring services on various websites, including parenting websites and coupon service websites, Leone said. The Burbines also transported children to another family’s home for day care and ran a summer activities program in which they took children to various places, Leone said.

Middlesex County investigators said on Burbine's computer, they found images and videos of the 13 infants and young children posed in various states of nudity and engaged in sexual acts, as well as videos of the assaults on the victims.

Burbine was arrested on Sept. 28 after an investigation into allegations of unlicensed child care at Waterfall Education Center uncovered evidence of a sexual assault on a child, Leone said. At that time, he was arraigned on sexual assault on a child and 10 counts of possessing child pornography and ordered held without bail.

After Burbine's September arrest, more victims, as well as video evidence showing assaults on victims, were discovered, Leone said.

Burbine will return to court on Dec. 12.

Leone said the case is one of the worst the county has ever prosecuted.

"This is among the most troubling and disturbing cases of child abuse ever prosecuted in Middlesex County. This defendant is accused of sexually assaulting more than a dozen children in his care, cruelly violating them and painfully betraying the trust of their parents,” Leone said.

Burbine's wife, Marian, 46, was indicted by a Middlesex grand jury on six counts of reckless endangerment of a child and two counts of operating an unlicensed day care business.

She is currently under house arrest. She will return to court on Dec. 20.

Sources told Team 5 that Burbine was convicted of three counts of indecent assault and battery on a child under the age of 14 in a 1989 case out of Woburn District Court. As a result of that case he was registered as a Level 1 sex offender which is the least likely to reoffend.

There were two other allegations against Burbine that did not move forward because of a lack of evidence. In 2005 a 7 year claimed abuse, and in 2009, a 5 year old also claimed abuse.

Burbine's registration with the State Sex Offender Registry Board expired in 2008.

Burbine also used to work at the REI store in Reading.

"He is no longer an employee at REI," the retailer's spokeswoman Megan Behrbaum said in a statement.

Burbine is the son of a Wakefield police officer who retired in the 1970s.

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